问题 单项选择题

A boy walking along a road at 3 kilometers per hour is overtaken by 3 truck traveling at 40 kilometers per hour. If the truck breaks down 1 kilometer beyond where it passes the boy, how many minutes after the breakdown does the boy reach the truck ?()

A.A

B.B

C.C

D.D

E.E

答案

参考答案:E

解析:

设该男孩行走1公里所用的时间为分钟,而货车行驶1公里所用的时间为分钟,所以该男孩在故障发生后到达现场所用的时间为

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单项选择题